The Mozilla Manifesto should not be taken to be the total sum of what Mozilla, as an organization, believes. Their Manifesto is about how they believe the internet should behave and be treated, not how the company itself should behave and act with regards to its own employees.
"The Mozilla Manifesto should not be taken to be the total sum of what Mozilla, as an organization, believes."
That's the deal. They all think differently on subjects unrelated to the Manifesto. True, there may be cases where the ratio is 99% against 1%. But it's still there.